"""Tests for the fly command."""

import time
from unittest.mock import AsyncMock, MagicMock

import pytest

from mudlib.commands import fly, look, movement
from mudlib.effects import active_effects
from mudlib.player import Player, players


@pytest.fixture
def mock_writer():
    writer = MagicMock()
    writer.write = MagicMock()
    writer.drain = AsyncMock()
    return writer


@pytest.fixture
def mock_reader():
    return MagicMock()


@pytest.fixture
def mock_world():
    world = MagicMock()
    world.width = 100
    world.height = 100
    world.wrap = MagicMock(side_effect=lambda x, y: (x % 100, y % 100))
    viewport = [["." for _ in range(21)] for _ in range(11)]
    world.get_viewport = MagicMock(return_value=viewport)
    return world


@pytest.fixture
def player(mock_reader, mock_writer):
    return Player(name="shmup", x=50, y=50, reader=mock_reader, writer=mock_writer)


@pytest.fixture(autouse=True)
def clean_state(mock_world):
    """Clean global state before/after each test."""
    fly.world = mock_world
    look.world = mock_world
    movement.world = mock_world
    players.clear()
    active_effects.clear()
    yield
    players.clear()
    active_effects.clear()


# --- direction parsing ---


@pytest.mark.asyncio
async def test_fly_east_moves_5_tiles(player):
    """fly east should move player 5 tiles east."""
    players[player.name] = player
    await fly.cmd_fly(player, "east")

    assert player.x == 55
    assert player.y == 50


@pytest.mark.asyncio
async def test_fly_north_moves_5_tiles(player):
    players[player.name] = player
    await fly.cmd_fly(player, "north")

    assert player.x == 50
    assert player.y == 45


@pytest.mark.asyncio
async def test_fly_northwest_moves_5_diagonal(player):
    players[player.name] = player
    await fly.cmd_fly(player, "nw")

    assert player.x == 45
    assert player.y == 45


@pytest.mark.asyncio
async def test_fly_wraps_around_world(player):
    """Flying near an edge should wrap toroidally."""
    player.x = 98
    player.y = 50
    players[player.name] = player
    await fly.cmd_fly(player, "east")

    # 98 + 5 = 103, wraps to 3
    assert player.x == 3
    assert player.y == 50


# --- cloud trail ---


@pytest.mark.asyncio
async def test_fly_creates_cloud_trail(player):
    """Flying should leave ~ effects along the path."""
    players[player.name] = player
    await fly.cmd_fly(player, "east")

    # trail at positions 50,51,52,53,54 (start through second-to-last)
    # player ends at 55
    assert len(active_effects) == 5
    trail_positions = [(e.x, e.y) for e in active_effects]
    for i in range(5):
        assert (50 + i, 50) in trail_positions


@pytest.mark.asyncio
async def test_cloud_trail_chars_are_tilde(player):
    players[player.name] = player
    await fly.cmd_fly(player, "east")

    for e in active_effects:
        assert e.char == "~"


@pytest.mark.asyncio
async def test_cloud_trail_has_ttl(player):
    """Cloud effects should expire after roughly 2 seconds."""
    players[player.name] = player

    before = time.monotonic()
    await fly.cmd_fly(player, "east")

    for e in active_effects:
        remaining = e.expires_at - before
        assert 1.5 <= remaining <= 2.5


@pytest.mark.asyncio
async def test_fly_diagonal_trail(player):
    """Diagonal flight should leave trail at each intermediate step."""
    players[player.name] = player
    await fly.cmd_fly(player, "se")

    # southeast: dx=1, dy=1, 5 steps
    # trail at (50,50), (51,51), (52,52), (53,53), (54,54)
    # player ends at (55, 55)
    assert len(active_effects) == 5
    trail_positions = [(e.x, e.y) for e in active_effects]
    for i in range(5):
        assert (50 + i, 50 + i) in trail_positions


# --- messages ---


@pytest.mark.asyncio
async def test_fly_sends_self_message(player, mock_writer):
    """Player should see 'You fly into the air'."""
    players[player.name] = player
    await fly.cmd_fly(player, "east")

    calls = [str(c) for c in mock_writer.write.call_args_list]
    assert any("fly" in c.lower() and "air" in c.lower() for c in calls)


@pytest.mark.asyncio
async def test_fly_sends_nearby_message(player):
    """Other players should see '{name} lifts into the air'."""
    players[player.name] = player

    other_writer = MagicMock()
    other_writer.write = MagicMock()
    other_writer.drain = AsyncMock()
    other = Player(
        name="bystander", x=52, y=50, reader=MagicMock(), writer=other_writer
    )
    players[other.name] = other

    await fly.cmd_fly(player, "east")

    calls = [str(c) for c in other_writer.write.call_args_list]
    assert any("shmup" in c.lower() and "lifts" in c.lower() for c in calls)


@pytest.mark.asyncio
async def test_fly_no_direction_gives_error(player, mock_writer):
    """fly with no args should tell the player to specify a direction."""
    players[player.name] = player
    await fly.cmd_fly(player, "")

    calls = [str(c) for c in mock_writer.write.call_args_list]
    assert any("direction" in c.lower() for c in calls)
    assert player.x == 50
    assert player.y == 50


@pytest.mark.asyncio
async def test_fly_bad_direction_gives_error(player, mock_writer):
    """fly with an invalid direction should give feedback."""
    players[player.name] = player
    await fly.cmd_fly(player, "sideways")

    calls = [str(c) for c in mock_writer.write.call_args_list]
    assert any("direction" in c.lower() for c in calls)
    assert player.x == 50
    assert player.y == 50


@pytest.mark.asyncio
async def test_fly_triggers_look(player, mock_world):
    """Flying should auto-look at the destination."""
    players[player.name] = player
    await fly.cmd_fly(player, "east")

    # get_viewport is called by look, which fly triggers
    assert mock_world.get_viewport.called